@article{AIHPA_1991__54_1_43_0,
     author = {Ozawa, Tohru},
     title = {Invariant subspaces for the {Schr\"odinger} evolution group},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {43--57},
     publisher = {Gauthier-Villars},
     volume = {54},
     number = {1},
     year = {1991},
     mrnumber = {1102971},
     zbl = {0734.35090},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1991__54_1_43_0/}
}